/*
 * Copyright (C) 2011 Cedric Fung (wolfplanet@gmail.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.vov.vitamio.widget;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.text.Layout;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.widget.TextView;

/**
 * Display text with border, use the same XML attrs as
 * {@link android.widget.TextView}, except that {@link io.vov.vitamio.widget.OutlineTextView} will
 * transform the shadow to border
 */
public class OutlineTextView extends TextView {
	public OutlineTextView(Context context) {
		super(context);
		initPaint();
	}

	public OutlineTextView(Context context, AttributeSet attrs) {
		super(context, attrs);
		initPaint();
	}

	public OutlineTextView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		initPaint();
	}

	private void initPaint() {
		mTextPaint = new TextPaint();
		mTextPaint.setAntiAlias(true);
		mTextPaint.setTextSize(getTextSize());
		mTextPaint.setColor(mColor);
		mTextPaint.setStyle(Paint.Style.FILL);
		mTextPaint.setTypeface(getTypeface());

		mTextPaintOutline = new TextPaint();
		mTextPaintOutline.setAntiAlias(true);
		mTextPaintOutline.setTextSize(getTextSize());
		mTextPaintOutline.setColor(mBorderColor);
		mTextPaintOutline.setStyle(Paint.Style.STROKE);
		mTextPaintOutline.setTypeface(getTypeface());
		mTextPaintOutline.setStrokeWidth(mBorderSize);
	}

	public void setText(String text) {
		super.setText(text);
		mText = text.toString();
		requestLayout();
		invalidate();
	}

	@Override
  public void setTextSize(float size) {
		super.setTextSize(size);
		requestLayout();
		invalidate();
		initPaint();
	}

	@Override
  public void setTextColor(int color) {
		super.setTextColor(color);
		mColor = color;
		invalidate();
		initPaint();
	}

	@Override
  public void setShadowLayer(float radius, float dx, float dy, int color) {
		super.setShadowLayer(radius, dx, dy, color);
		mBorderSize = radius;
		mBorderColor = color;
		requestLayout();
		invalidate();
		initPaint();
	}

	@Override
  public void setTypeface(Typeface tf, int style) {
		super.setTypeface(tf, style);
		requestLayout();
		invalidate();
		initPaint();
	}

	@Override
  public void setTypeface(Typeface tf) {
		super.setTypeface(tf);
		requestLayout();
		invalidate();
		initPaint();
	}

	@Override
	protected void onDraw(Canvas canvas) {
		Layout layout = new StaticLayout(getText(), mTextPaintOutline, getWidth(), Layout.Alignment.ALIGN_CENTER, mSpacingMult, mSpacingAdd, mIncludePad);
		layout.draw(canvas);
		layout = new StaticLayout(getText(), mTextPaint, getWidth(), Layout.Alignment.ALIGN_CENTER, mSpacingMult, mSpacingAdd, mIncludePad);
		layout.draw(canvas);
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		Layout layout = new StaticLayout(getText(), mTextPaintOutline, measureWidth(widthMeasureSpec), Layout.Alignment.ALIGN_CENTER, mSpacingMult, mSpacingAdd, mIncludePad);
		int ex = (int) (mBorderSize * 2 + 1);
		setMeasuredDimension(measureWidth(widthMeasureSpec) + ex, measureHeight(heightMeasureSpec) * layout.getLineCount() + ex);
	}

	private int measureWidth(int measureSpec) {
		int result = 0;
		int specMode = MeasureSpec.getMode(measureSpec);
		int specSize = MeasureSpec.getSize(measureSpec);

		if (specMode == MeasureSpec.EXACTLY) {
			result = specSize;
		} else {
			result = (int) mTextPaintOutline.measureText(mText) + getPaddingLeft() + getPaddingRight();
			if (specMode == MeasureSpec.AT_MOST) {
				result = Math.min(result, specSize);
			}
		}

		return result;
	}

	private int measureHeight(int measureSpec) {
		int result = 0;
		int specMode = MeasureSpec.getMode(measureSpec);
		int specSize = MeasureSpec.getSize(measureSpec);

		mAscent = (int) mTextPaintOutline.ascent();
		if (specMode == MeasureSpec.EXACTLY) {
			result = specSize;
		} else {
			result = (int) (-mAscent + mTextPaintOutline.descent()) + getPaddingTop() + getPaddingBottom();
			if (specMode == MeasureSpec.AT_MOST) {
				result = Math.min(result, specSize);
			}
		}
		return result;
	}

	private TextPaint mTextPaint;
	private TextPaint mTextPaintOutline;
	private String mText = "";
	private int mAscent = 0;
	private float mBorderSize;
	private int mBorderColor;
	private int mColor;
	private float mSpacingMult = 1.0f;
	private float mSpacingAdd = 0;
	private boolean mIncludePad = true;
}